User`s manual

RadiCS
Chapter 10 Information
96
English
Luminance Check
In DMG QCM, the luminance measurement does not include the ambient luminance. In RadiCS, an
apostrophe (’) in the L’max, for example, indicates that it includes the ambient luminance. However,
entering the ambient luminance value as 0 cd/m
2
can effectively exclude the ambient luminance from
the luminance measurement.
Note that none of inequalities used in RadiCS includes an equality sign although every judgement
condition in JESRA includes it.
Performing the task setup defaults to the Lmax value at the calibration setting as the baseline value
of delta L’max.
Grayscale Check
In DMG QCM, the luminance measurement does not include the ambient luminance. In RadiCS, an
apostrophe (’) in the L’max, for example, indicates that it includes the ambient luminance. However,
entering the ambient luminance value as 0 cd/m
2
can effectively exclude the ambient luminance from
the luminance measurement.
The calculation method for this item is the same as the one for
κδ
. RadiCS describes the
specification of the grayscale as Target Error Rate < 15 % (or 30 %) of GSDF. Note that none of
inequalities used in RadiCS includes an equality sign.
This specification is provided as the judgement condition for DICOM Part 14 GSDF, so there is no
meaning to use this specification for other display functions. The number of measuring points is fixed
to 18 points and this value cannot be changed. (The number of data points will be 17 because the
result is presented as (JNDn+1-JNDn)/2.)
Uniformity Check
Although DMG QCM includes an equality sign, each judgement condition in RadiCS does not. The
DMG QCM specifies that the luminance is measured using the TG18-UN80 patterns. On the other
hand, RadiCS displays two windows (grayscale: 204) with the size of 10 % of the whole display
area at the center and a corner of the screen. It then measures the luminance at the center of both
windows.
Sensors
DMG QCM permits the use of both noncontact and contact type measuring devices. For a
noncontact type measuring device, since RadiCS measures the luminance without blocking the
ambient light, you should use a dark room or a cylinder to block the ambient light. Any sensors can
be used to perform both the acceptance tests and the constancy tests.
Multiple Monitors
DMG QCM includes a determination for multiple monitors, but by default RadiCS is set not to make
such a determination. If necessary, make settings as indicated in the table above. JESRA includes an
equality sign but RadiCS does not.